Screw-cutting machine.



P. HIRSGH.

SCREW CUTTING MACHINE.

APPLICATION FILED JUNE 3, 1910.

Patented June 10, 1913.

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ammwcoz Witnesses Gbtowm F. HIRSGH.

SCREW CUTTING MAGHINE.

APPLICATION FILED JUNE 3, 1910. 1,064,218. Patented June 10, 1913.

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UNTED STATE PATENT @FFIQE.

FRANK HIRSCH, OF ERIE, PENNSYLVANIA, ASSIGNOR T0 JARECKI MANUFACTURINGCOMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA.

SCREW-CUTTING MACHINE.

inc eels.

Specification of Letters Patent.

Patented June 1%,1913.

Application filed June 3, 1910. Serial No. 564,821.

To all whom it may concern Be it known that I, FRANK Hmsorr, a citizenof the United States, residing at Erie, in the county of Erie and Stateof Pennsylvania, have invented new and useful Improvements inScrew-Cutting Machines, of which the following is a specification.

This invention relates to improvements in screw cutting machines, andconsists in certain improvements in the construction thereof as will behereinafter fully described and pointed out in the claims.

More particularly, the invention relates to screw cutting machines forcutting screws on pipe fittings. These fittings usually have more orless irregular faces, particularly that part of the face formed at theparting of the mold. This irregularity in the face of the fitting ofteninterferes materially with the ready entering of the pipe into thefitting. For this reason, it has been found desirable to face the end ofthe fitting, and where the fitting is interiorly screw threaded, it ispreferable to make this face tapering, so as to assist in the enteringof the pipe, and also to reduce the amount of stock necessary to beremoved to secure an even face. Some fittings such as unions, are facednot only to facilitate the entering of the threads of the pipe, but alsoto receive the usual gasket to make a better fit with the other part ofthe union and steam tight joint.

The object of this invention is to face the fitting, preferablysimultaneously, with the cutting of the screw.

The invention is illustrated in the accompanying drawings as follows:

Figure 1 shows a central section of the machine arranged to cut aninteriorly screw threaded fitting; Fig. 2 an end View of the same; Fig.3 an alternative construction, showing the machine arranged to face anexteriorly threaded fitting; Fig. at an end view of the constructionshown in Fig. 3.

In the construction shown in Fig. 1, 1 marks the fitting; 2 the tap; 2the usual clearance groove in the tap; 3 the spindle; 4 a set screw forsecuring the tap in the spindle; 5 a head in which the spindle ismounted. These are of common construction, the spindle being given arotary motion, and either the fittin or the spindle be ing fed as thescrew is ormed. After the back out the tap. The face cutter 6 is ar-'ranged in one of the grooves of the tap, the tap having the usualclearance grooves 2 It is carried by a face cutter spindle 7. It ispreferably of dovetailed shape, and arranged in a dovetailed groove 8,and its inner movement limited by a pin 8.

The mounting for the face cutter spindle 7 is as follows: An auxiliaryhead 8 is mounted in the head 5, and secured in place by a set screw 9.A shoulder 10 is arranged on the front end of the auxiliary head 8, anda normally stationary feed screw ring 11 is journaled on the auxiliaryhead 8. A friction washer 12 is placed between the shoulder 10 and thering 11. A follower 13 is mounted on the auxiliary head 8, and ispressed against the ring 11 by means of the springs 14: in the collar,15. These springs exert sufiicient pressure normally to hold the ring 11in a fixed or stationary position, but yield after the completion of thecut to stop the feedin motion. The ring 11 has the screw threads 16 onits outer periphery, on which the screw threads 17 on the interior ofthe face cutting spindle 7 operate. The ring 11 has the stop pin 18 onits rear face, and the stop pin 19 on its front face. A. stop pin 20 isarranged in a plunger collar 21 secured on the end of the face cutterspindle 7, the pin 20, therefore, being fixed with the cutter spindle 7.The pin 18 is arranged in the path of the pin 20, so that when the facecutter spindle 7 reaches the desired inner limit of its feed, the pin 20engages the pin 18, and thus fixes it with the ring 11, after which therin 11 rotates with the cutter'spindle, and the forward or feedingmovement of the cutter face spindle ceases as the two parts, the ring 11and spindle Z-rotate together. The spindle 7 is driven both in itsfeeding movement and backing out movement, by the cutter 6 acting as akey in one of the grooves of the tap 2. The groove, therefore, not onlypermits of the proper locating of the cutter so as to face the end ofthe fitting to the inner edge of the thread, but it also acts as a keyway. The stop 22 on the interior of the face cutter spindle 7 limits thebacking out movement of the cutter spindle 7 relatively to'the tap. Thisis accomplished by the pin 22,

coming into contact with the pin 19 on the ring 11 at the desired end ofthe movement. Any movement may be given to the cutter by extending thescrew 17 or the stop pins.

The operation of the device will be read ily understood from theforegoing description. The fitting is brought into position, and eitherthe fitting moves to the tap or the tap to. the fitting, the taprotating forwardly. As the tap rotates forwardly, it cuts the thread,and at the same time rotates the face cutter spindle, thus feeding itforward. The feed. screw of the face cutter spindle is preferablypitched to feed the cutter forward less rapidly than the tap, thus amore gradual cut may be taken, and. of course, after the pin 20contacts, the pin 18 stops the forward movement of the face cutter, andthe continuing rotation, finishes the face, so that it has a uniformsurface throughout the circumference of the fitting. Not only this, butany tendency to form a bur in the face of the fitting is prevented bythe cutter. As the tap is reversed, the stop pin 20 moves away from thepin 18, and at the completion of one rotation is moved axiallysuiiiciently to clear the pin 18, so as topermit of the continuedrotation of the spindle 7, relatively to the ring 11, so that the facecutter is backed off with the tap. The rearward movement of the cuttercontinues until the pin contacts the pin after which the rotation of thetap continues the rear movement of the tap relatively to the cutter tobring it into position to start a new operation.

In the alternative construction, 1 marks the pipe fitting; 2" the diesfor cutting the exterior thread-s. These are carried in the die head 2.The die head is carried by a spindle 3", and is secured in the spindleby the set screw 4 The cutter comprises the interior cutting tool 6 forfacing the inner surface of the fitting, and the face cutting tool (5.The cutter has the spindle 7 and extends into the socket 3 in thespindle 3. A pin 7" extends through the perforation 7 in the rear end ofthe spindle 7 This pin extends through the slots 5' in the spindle 8 andis secured to the spindle head 7. The spindle head 7 is similar to thespindle on the head 7, and the other parts are similar to the parts inFig. 1, and operate in the same manner.

By the use of the term face cutter, I do not mean necessarily a cuttercutting a face at right angles to. the axis but any finishing tool forfacing the end, as, for instance, the cutter 6 as distinguished from ascrew thread cutter.

What I claim as new is:

I. In a screw cutting machine, the combination of a spindle; a facecutter rotated with the spindle; a screw cutter carried by the spindle;a feed screw; and means con- 5 necting the face cutter and feed screw togive to the face cutter through a part of its travel a feedmovementdirectly following the feed movement of the screw.

In a screw cutting machine, the combination of a spindle; a face cutterrotated with the spindle; a screw cutter carried by the spindle; a feedscrew; and means mounted concentric with the spindle connecting the facecutter and feed screw to give to the face cutter through a part of itstravel a feed movementdirectly following t-he feed movement of thescrew.

3. In a screw cutting machine, the combi'uation of a spindle; a facecutter rotating with the spindle; a screw cutter carried by the spindle,said face cutter and screw cutter being ii'iovable relatively to eachother in an axial direction; and feeding means concentric with thespindle for feeding axially said face cutter and screw cutter differentdistances.

t. in a screw cutting machine, the combination of a spindle; a facecutter rotating with the spindle; a screw cutter -arried by the spindle;screw actuated means concentric with the spindle for feeding said facecutter and screw cutter and devices for varying the axial. movement ofthe face cutter relatively to the screw cutter.

5. In a screw cutting machine, the combination of a spindle; a facecutter rotating with the spindle; a screw cutter carried by the spindle;means for feeding axially the face cutter with the screw cutter; anddevices for arresting the feed movement of the face cutter independentlyof the screw cutter.

6. in a screw cutting machine, the combination of a spindle; a facecutter rotating with the spindle; a screw cutter carried by the spindle;means for feeding axially the face cutter with the screw cutter; and devices for arresting the movement of the face cutter independently of thescrew cutter and for automatically retracting the face cutter with thescrew cutter.

7. in a screw cutting machine, the combination of a spindle; a facecutter rotating with the spindle; a screw cutter carried by the spindle;means mounted concentric with the spindle for feeding the face cutterand screw cutter; and devices for arresting the feed movement of theface cutter independently of the screw cutter.

8. In a screw cutting machine, the combination of a spindle; a screwcutting device on the spindle; a face cutter; a screw feed for the facecutter comprising a rotating member moving with the face cutter and anormally stationary member; and means for yieldingly holding thestationary member.

9. In a screw cutting machine, the combination of a spindle; a screwcutting device on the spindle; a face cutter; a screw feed for the facecutter comprising a rotating member moving with the face cutter and anormally stationary member; means for yieldingly holding the stationarymember and devices on the members for locking the normally stationarymember with the rotating member to limit the feeding movement.

10. In a screw cutting machine, the combination of a spindle; a screwcutting device on the spindle; a face cutter; a screw feed for the facecutter comprising a rotating member moving with the face cutter and anormally stationary member; means for yieldingly holding the stationarymember; and devices on the members for locking the normally stationarymember with the rotating member to limit the axial movement of the facecutter in both directions.

11. In a screw cutting machine, the combination of a spindle; a tapcarried by the spindle, said tap having a clearance groove; a facecutter arranged in the clearance groove; a screw feed for the facecutter, comprising a rotating member moving with the face cutter, and anormally stationary member; means for yieldingly holding the normallystationary member to produce the feeding movement; and devices on themembers for locking the normally stationary member with the rotatingmember to limit the feeding movement.

12. In a screw cutting machine, the combination of a spindle; a screwcutting device on the spindle; a face cutter; a screw feed for the facecutter comprising a rotating.

the rotating member to limit the feeding movement.

13. In a screw threading machine, the combination of a spindle, a taparranged in the spindle, said tap having a clearance groove; a facecutter arranged in said groove, the tap being arranged to drive thecutter, through the engagement of the cutter with the walls of thegroove; a screw feed for the cutter comprising a rotating member movingwith the cutter and a normally stationary member; means for yieldinglyholding the normally stationary member; and devices on the members forlocking the normally stationary member with the rotating member to limitthe feeding movement.

14. In a screw threading machine, the combination of a spindle; a screwthreading device on the spindle; a face cutter; a head in which thespindle is mounted; an auxiliary head secured thereto; a screw threadedfeed ring arranged on the auxiliary head; devices on the auxiliary headfor frictionally holding said screw threaded feed ring from rotationrelatively to the head; a face cutter spindle secured to the face cutterand having a screw thread engaging the screw thread on the feed ring;and stops for limiting the relative movement of the feed ring andspindle.

In testimony whereof, I have hereunto set my hand in the presence of twosubscribing witnesses.

FRANK HIR SCH.

l/Vitnesses:

C. D. HIGBY, ROBERT JARECKI.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington. D. C."

